<!DOCTYPE html>
<body>BFCached<a href="target.html">next</a></body>
<script>
  window.addEventListener('DOMContentLoaded', () => {
    const iframe = document.createElement('iframe');
    const url = new URL(location.href);
    url.hostname = url.hostname === 'localhost' ? '127.0.0.1' : 'localhost';
    url.pathname = '/cached/bfcache/worker-iframe.html';
    iframe.src = url.toString();
    document.body.appendChild(iframe);
  }, false);
</script>
